Re: [PATCH v2] ARM: omap3: beagleboard-xm: dt: Add ethernet to the device tree

* Rob Herring [off-list ref] [170105 10:51]:

On Thu, Jan 5, 2017 at 10:48 AM, Laurent Pinchart
[off-list ref] wrote:

quoted

Hello,

On Thursday 05 Jan 2017 08:39:29 Tony Lindgren wrote:

quoted

* Rob Herring [off-list ref] [170105 08:28]:

quoted

On Fri, Dec 2, 2016 at 3:11 PM, Laurent Pinchart wrote:

quoted

The Beagleboard-xM has a LAN9514 USB hub and ethernet controller,
connected to port 2 of the OMAP EHCI controller. The board however has
no EEPROM to store the ethernet MAC address, which is programmed by the
boot loader.

To allow Linux to use the same MAC address as the boot loader (or for
that matter any fixed MAC address), we need a node in the device tree
for the ethernet controller that the boot loader can update at runtime
with a local-mac-address property. Add it, along with an alias for the
ethernet controller to let the boot loader locate it easily.

Signed-off-by: Laurent Pinchart <laurent.pinchart-ryLnwIuWjnjg/C1BVhZhaw@public.gmane.org>
---
Changes since v1:

- Renamed usb2 DT node to hub
---

 arch/arm/boot/dts/omap3-beagle-xm.dts | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/arch/arm/boot/dts/omap3-beagle-xm.dts

b/arch/arm/boot/dts/omap3-beagle-xm.dts index
85e297ed0ea1..673cee2234b2 100644

--- a/arch/arm/boot/dts/omap3-beagle-xm.dts
+++ b/arch/arm/boot/dts/omap3-beagle-xm.dts

@@ -27,6 +27,7 @@
        aliases {
                display0 = &dvi0;
                display1 = &tv0;
+               ethernet = &ethernet;

Sorry, just noticed this, but this should be dropped. It's not used
nor do we want an alias here.

OK, will update locally as I have not pushed out yet.

The ethernet alias is used by U-Boot to locate the ethernet controller and
update the MAC address.

Okay. Though with only only one, I don't see why that is hard to find.
Anyway, this is the least of u-boot's DT abuses.

Applying Laurent's original patch then into omap-for-v4.11/dt.

Tony
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